MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization
A primary adduct of MgCl2.3.3EtOH (A0) was prepared by melt quenching and then it was further dealcoholated by thermal and chemical methods. In thermal dealcoholation, two different support samples with MgCl2.2.7EtOH (A1) and MgCl2.1.8EtOH (A2) formulas were prepared using a controlled temperature-p...
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Iran Polymer and Petrochemical Institute
2013-08-01
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| Series: | علوم و تکنولوژی پلیمر |
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| Online Access: | http://jips.ippi.ac.ir/article_910_c6d869c8debee2b3b6905ffe0005f8e4.pdf |
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| author | Najmeh Hadian Mehdi Nekoomanesh-Haghighi Shokoofeh Hakim Naeimeh Bahri-Laleh |
| author_facet | Najmeh Hadian Mehdi Nekoomanesh-Haghighi Shokoofeh Hakim Naeimeh Bahri-Laleh |
| author_sort | Najmeh Hadian |
| collection | DOAJ |
| description | A primary adduct of MgCl2.3.3EtOH (A0) was prepared by melt quenching and then it was further dealcoholated by thermal and chemical methods. In thermal dealcoholation, two different support samples with MgCl2.2.7EtOH (A1) and MgCl2.1.8EtOH (A2) formulas were prepared using a controlled temperature-pressure program. XRD spectra of A0, A1 and A2 supports were similar, except with the peaks at 2θ = 8.9 and 9.7 which decreased by moving from A0 to A2. After preparation of support samples, final catalysts were prepared by reacting support samples with TiCl4 in the presence of diisobutylphthalate as internal electron donor and examined in slurry phase propylene polymerization using TEA as cocatalyst and diphenyldimethoxysilane as external electron donor. The results showed that in the catalysts prepared using thermal dealcoholated supports, surface area and Ti content increase by moving from A0 to A2 (decreasing ethanol content of the support). In this respect, the variation in dealcoholation level, due to different dealcoholation time, influenced the catalytic activity considerably and maximum activity was observed at A1 sample and then by further dealcoholation the catalyst activity was dropped. Also, chemical dealcoholation was carried out using 1 M triethylaluminum (TEA) at 20 and 80˚C, and the prepared supports were designated as A3 and A4, respectively. In chemical dealcoholation samples, support structure was totally destroyed and no peak was observed at XRD spectra. The final catalysts were prepared likewise, and examined in slurry phase polymerization of propylene using TEA as cocatalyst. By destruction of support structure, Ti content was decreased significantly and hence the catalyst activity was dropped compared to the catalysts prepared by thermal dealcoholation route. |
| first_indexed | 2024-12-17T12:12:29Z |
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| id | doaj.art-87464486e13b4069ba4da6cb6bda033e |
| institution | Directory Open Access Journal |
| issn | 1016-3255 2008-0883 |
| language | fas |
| last_indexed | 2024-12-17T12:12:29Z |
| publishDate | 2013-08-01 |
| publisher | Iran Polymer and Petrochemical Institute |
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| series | علوم و تکنولوژی پلیمر |
| spelling | doaj.art-87464486e13b4069ba4da6cb6bda033e2022-12-21T21:49:21ZfasIran Polymer and Petrochemical Instituteعلوم و تکنولوژی پلیمر1016-32552008-08832013-08-0126326625710.22063/jipst.2013.910910MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene PolymerizationNajmeh Hadian0Mehdi Nekoomanesh-Haghighi1Shokoofeh Hakim2Naeimeh Bahri-Laleh3Faculty of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, IranFaculty of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, IranFaculty of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, IranFaculty of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, IranA primary adduct of MgCl2.3.3EtOH (A0) was prepared by melt quenching and then it was further dealcoholated by thermal and chemical methods. In thermal dealcoholation, two different support samples with MgCl2.2.7EtOH (A1) and MgCl2.1.8EtOH (A2) formulas were prepared using a controlled temperature-pressure program. XRD spectra of A0, A1 and A2 supports were similar, except with the peaks at 2θ = 8.9 and 9.7 which decreased by moving from A0 to A2. After preparation of support samples, final catalysts were prepared by reacting support samples with TiCl4 in the presence of diisobutylphthalate as internal electron donor and examined in slurry phase propylene polymerization using TEA as cocatalyst and diphenyldimethoxysilane as external electron donor. The results showed that in the catalysts prepared using thermal dealcoholated supports, surface area and Ti content increase by moving from A0 to A2 (decreasing ethanol content of the support). In this respect, the variation in dealcoholation level, due to different dealcoholation time, influenced the catalytic activity considerably and maximum activity was observed at A1 sample and then by further dealcoholation the catalyst activity was dropped. Also, chemical dealcoholation was carried out using 1 M triethylaluminum (TEA) at 20 and 80˚C, and the prepared supports were designated as A3 and A4, respectively. In chemical dealcoholation samples, support structure was totally destroyed and no peak was observed at XRD spectra. The final catalysts were prepared likewise, and examined in slurry phase polymerization of propylene using TEA as cocatalyst. By destruction of support structure, Ti content was decreased significantly and hence the catalyst activity was dropped compared to the catalysts prepared by thermal dealcoholation route.http://jips.ippi.ac.ir/article_910_c6d869c8debee2b3b6905ffe0005f8e4.pdfmgcl2 supportdealcoholationziegler-natta catalystpolymerizationpolypropylene |
| spellingShingle | Najmeh Hadian Mehdi Nekoomanesh-Haghighi Shokoofeh Hakim Naeimeh Bahri-Laleh MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization علوم و تکنولوژی پلیمر mgcl2 support dealcoholation ziegler-natta catalyst polymerization polypropylene |
| title | MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization |
| title_full | MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization |
| title_fullStr | MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization |
| title_full_unstemmed | MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization |
| title_short | MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization |
| title_sort | mgcl2 support preparation techniques and their effects on ziegler natta catalysts performance in propylene polymerization |
| topic | mgcl2 support dealcoholation ziegler-natta catalyst polymerization polypropylene |
| url | http://jips.ippi.ac.ir/article_910_c6d869c8debee2b3b6905ffe0005f8e4.pdf |
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